Documents show flash crash trader's frenetic business dealings

By Sarah N. Lynch, Tom Polansek and Douwe Miedema WASHINGTON/CHICAGO (Reuters) - The Briton blamed for contributing to the May 2010 Wall Street flash crash maintained frenetic relationships with a series of brokers, banks and software firms that appear to mirror his rapid-fire trading activity, U.S. court documents showed. Navinder Singh Sarao, 36, was arrested in London on criminal charges this week, and authorities have sought to link his trades to the flash crash, when about $1 trillion was b